LINEAR TECHNOLOGY LTM2882 Technical data
Isolated RS232 + 1W Power
3.3V or 5V
Isolated Power
T1IN T1OUT
R1OUT R1IN
T2IN T2OUT
R2OUT R2IN
REG
5V
RS232
BUS
LTM2882
Galvanic Isolation
Complete 1Mbps µModule® Transceiver Includes 2500V
Isolated Power—
RMS
No External Components Required
The LTM®2882 is an isolated RS232 transceiver that guards against large ground-to-ground differentials. The LTM2882’s internal
inductive isolation barrier breaks ground loops by isolating the logic level interface and line transceiver. An onboard DC/DC
converter provides power to the transceiver, with an isolated 5V supply output for powering additional system circuitry.
With 2500V
external components and provides a small, complete µModule solution for isolated serial data communications.
galvanic isolation, onboard secondary power and two RS232 drivers and receivers, the LTM2882 requires no
RMS
Features
n
Isolator µModule Technology
n
Isolated RS232 Transceiver: 2500V
n
UL Recognized
n
Integrated Isolated, 1W DC/DC Converter
n
Good Efficiency (Up to 65%)
n
Low EMI
n
1.62V to 5.5V Logic Supply
n
High Speed Operation
File #E151738
®
n 1Mbps for 250pF/3kΩ Load
n
250kbps for 1nF/3kΩ Load
n 100kbps for 2.5nF/3kΩ TIA/EIA-232-F Load
n
3.3V (LTM2882-3) or 5V (LTM2882-5) Operation
n
No Damage or Latchup to ±10kV ESD HBM on Isolated
RS232 Interface and Across Isolation Barrier
n
High Common Mode Transient Immunity: >30kV/µs
n
Low Profile Surface Mount (15mm × 11.25mm × 2.8mm)
LGA and (15mm × 11.25mm × 3.7mm) BGA Packages
RMS
L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are
registered trademarks and Isolator logo is a trademark of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
LTM2882 Demo Board
Isolator µModule Technology
V
CURRENT (mA)
TOP VIEW
To achieve greater than 2500V
isolation, the LTM2882 utilizes
Isolator µModule Technology, which
uses coupled signal inductors
embedded in the µModule substrate.
This technique ensures consistent
ruggedness and reliability, and will
be certified by UL, CSA and IEC
to guarantee the isolation barrier’s
effectiveness. The μModule package
integrates several technologies to deliver a cost-effective,
advanced solution that minimizes board space and improves
electrical and thermal performance.
RMS
1
2 3 4 5 6 7 8
R2OUT
A
B
C
D
E
F
G
H
J
K
L
R2IN
T2OUT
32-PIN (15mm × 11.25mm × 2.8mm)
LGA PACKAGE
GND
GND2
V
V
ONDINT1INR1OUTT2IN
DE
DOUTT1OUTR1IN
CC
L
V
CC2
Common Mode Transient Immunity
2V/DIV
2V/DIV
500V/DIV
T1IN
T1OUT = R1IN
R1OUT
DI
RO
50ns/DIV
MULTIPLE SWEEPS
OF COMMON MODE
TRANSIENTS
Unlike other isolated solutions, the LTM2882 allows
communication through common mode transient events greater
than 30kV/µs, unaffected by the transient and without introducing
any priority data jitter or data corruption.
Isolated Supply Voltage Output
The LTM2882 is self-powered and provides a well regulated 5V, up to 1W,
isolated supply for powering any supporting components on the isolated
bus side. This regulated power is continuously available over the operating
temperature range, even while driving RS232 compliant signal levels.
300
250
200
150
100
CC2
T1OUT AND T2OUT
BAUD = 100kbps
50
= 3k, CL = 2.5nF
R
L
V
CC2
0
–50
= 4.8V
TEMPERATURE (°C)
VCC = 5.0V
LTM2882-5
VCC = 3.3V
LTM2882-3
500 100
12525–25 75
TEST FREQUENCY
EN 61000–4–3
Annex D
80MHz to 1GHz 10V/m
1.4MHz to 2GHz 3V/m
STRENGTH
2MHz to 2.7GHz 1V/m
FIELD
EN 61000–4–8
50Hz to 60Hz 30A/m
Level 4
EN 61000–4–8
60Hz 100A/m*
Level 5
EN 61000–4–9
Pulse 1000A/m
Level 5
*non-IEC method
www.linear.com/2882 n 1-800-4-LINEAR
RF & Magnetic Field Immunity
The LTM2882 passes independent RF and magnetic field immunity test
requirements per European Standard EN55024, in accordance with the following
test standards: EN 61000-4-3 for radiated, radio frequency, electromagnetic field
immunity; EN 61000-4-8 for power frequency magnetic field immunity;
EN 61000-4-9 for pulsed magnetic field immunity.
0412E
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